| {"id": "t3_001", "difficulty": 3, "bug_type": "edge_case_only", "function_name": "merge_sorted", "buggy_code": "def merge_sorted(a, b):\n result = []\n i = j = 0\n while i < len(a) and j < len(b):\n if a[i] <= b[j]:\n result.append(a[i])\n i += 1\n else:\n result.append(b[j])\n j += 1\n return result", "original_code": "def merge_sorted(a, b):\n result = []\n i = j = 0\n while i < len(a) and j < len(b):\n if a[i] <= b[j]:\n result.append(a[i])\n i += 1\n else:\n result.append(b[j])\n j += 1\n result.extend(a[i:])\n result.extend(b[j:])\n return result", "initial_error": "AssertionError: merge_sorted([1,3],[2,4,5]) expected [1,2,3,4,5], got [1,2,3]", "bug_location": {"function": "merge_sorted", "line_start": 11}, "test_cases": [{"input": [[1, 3], [2, 4, 5]], "expected_output": [1, 2, 3, 4, 5]}, {"input": [[], [1, 2]], "expected_output": [1, 2]}, {"input": [[1, 2], []], "expected_output": [1, 2]}, {"input": [[1], [2]], "expected_output": [1, 2]}]} |
| {"id": "t3_002", "difficulty": 3, "bug_type": "subtle_logic", "function_name": "rotate_matrix", "buggy_code": "def rotate_matrix(matrix):\n n = len(matrix)\n for i in range(n):\n for j in range(i, n):\n matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]\n return matrix", "original_code": "def rotate_matrix(matrix):\n n = len(matrix)\n for i in range(n):\n for j in range(i, n):\n matrix[i][j], matrix[j][i] = matrix[j][i], matrix[i][j]\n for row in matrix:\n row.reverse()\n return matrix", "initial_error": "AssertionError: rotate_matrix([[1,2],[3,4]]) expected [[3,1],[4,2]], got [[1,3],[2,4]]", "bug_location": {"function": "rotate_matrix", "line_start": 6}, "test_cases": [{"input": [[[1, 2], [3, 4]]], "expected_output": [[3, 1], [4, 2]]}, {"input": [[[1, 2, 3], [4, 5, 6], [7, 8, 9]]], "expected_output": [[7, 4, 1], [8, 5, 2], [9, 6, 3]]}]} |
| {"id": "t3_003", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "process_user", "buggy_code": "def format_name(first, last):\n return f'{last}, {first}'\n\ndef process_user(first_name, last_name):\n return format_name(last_name, first_name)", "original_code": "def format_name(first, last):\n return f'{last}, {first}'\n\ndef process_user(first_name, last_name):\n return format_name(first_name, last_name)", "initial_error": "AssertionError: expected 'Doe, John', got 'John, Doe'", "bug_location": {"function": "process_user", "line_start": 5}, "test_cases": [{"input": ["John", "Doe"], "expected_output": "Doe, John"}, {"input": ["Alice", "Smith"], "expected_output": "Smith, Alice"}, {"input": ["A", "B"], "expected_output": "B, A"}, {"input": ["X", "Y"], "expected_output": "Y, X"}]} |
| {"id": "t3_004", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "calculate_total", "buggy_code": "def apply_discount(price, discount):\n return price - (price * discount)\n\ndef calculate_total(price, discount_rate):\n return apply_discount(discount_rate, price)", "original_code": "def apply_discount(price, discount):\n return price - (price * discount)\n\ndef calculate_total(price, discount_rate):\n return apply_discount(price, discount_rate)", "initial_error": "AssertionError: expected 80.0, got -19.8", "bug_location": {"function": "calculate_total", "line_start": 5}, "test_cases": [{"input": [100, 0.2], "expected_output": 80.0}, {"input": [50, 0.1], "expected_output": 45.0}, {"input": [200, 0.5], "expected_output": 100.0}, {"input": [10, 0.0], "expected_output": 10.0}]} |
| {"id": "t3_005", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "build_url", "buggy_code": "def join_parts(domain, path):\n return f'https://{domain}/{path}'\n\ndef build_url(domain, path):\n return join_parts(path, domain)", "original_code": "def join_parts(domain, path):\n return f'https://{domain}/{path}'\n\ndef build_url(domain, path):\n return join_parts(domain, path)", "initial_error": "AssertionError: expected 'https://example.com/api', got 'https://api/example.com'", "bug_location": {"function": "build_url", "line_start": 5}, "test_cases": [{"input": ["example.com", "api"], "expected_output": "https://example.com/api"}, {"input": ["google.com", "search"], "expected_output": "https://google.com/search"}, {"input": ["a.com", "b"], "expected_output": "https://a.com/b"}, {"input": ["x.org", "y"], "expected_output": "https://x.org/y"}]} |
| {"id": "t3_006", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "divide_numbers", "buggy_code": "def safe_divide(num, den):\n if den == 0:\n return 0\n return num / den\n\ndef divide_numbers(a, b):\n return safe_divide(b, a)", "original_code": "def safe_divide(num, den):\n if den == 0:\n return 0\n return num / den\n\ndef divide_numbers(a, b):\n return safe_divide(a, b)", "initial_error": "AssertionError: expected 2.0, got 0.5", "bug_location": {"function": "divide_numbers", "line_start": 7}, "test_cases": [{"input": [10, 5], "expected_output": 2.0}, {"input": [5, 0], "expected_output": 0}, {"input": [100, 10], "expected_output": 10.0}, {"input": [0, 5], "expected_output": 0.0}]} |
| {"id": "t3_007", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "create_rectangle", "buggy_code": "def calc_area(w, h):\n return w * h\n\ndef create_rectangle(width, height):\n return {'w': width, 'h': height, 'area': calc_area(height, height)}", "original_code": "def calc_area(w, h):\n return w * h\n\ndef create_rectangle(width, height):\n return {'w': width, 'h': height, 'area': calc_area(width, height)}", "initial_error": "AssertionError: doesn't strictly fail math but conceptually wrong", "bug_location": {"function": "create_rectangle", "line_start": 5}, "test_cases": [{"input": [5, 10], "expected_output": {"w": 5, "h": 10, "area": 50}}, {"input": [2, 3], "expected_output": {"w": 2, "h": 3, "area": 6}}, {"input": [1, 1], "expected_output": {"w": 1, "h": 1, "area": 1}}, {"input": [0, 5], "expected_output": {"w": 0, "h": 5, "area": 0}}]} |
| {"id": "t3_008", "difficulty": 3, "bug_type": "wrong_argument_order", "function_name": "power_wrapper", "buggy_code": "def compute_pow(base, exp):\n return base ** exp\n\ndef power_wrapper(base, exp):\n return compute_pow(exp, base)", "original_code": "def compute_pow(base, exp):\n return base ** exp\n\ndef power_wrapper(base, exp):\n return compute_pow(base, exp)", "initial_error": "AssertionError: expected 8, got 9", "bug_location": {"function": "power_wrapper", "line_start": 5}, "test_cases": [{"input": [2, 3], "expected_output": 8}, {"input": [3, 2], "expected_output": 9}, {"input": [5, 2], "expected_output": 25}, {"input": [2, 4], "expected_output": 16}]} |
| {"id": "t3_009", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "get_unique_items", "buggy_code": "seen = {1}\ndef filter_unique(items):\n res = []\n for item in items:\n if item not in seen:\n seen.add(item)\n res.append(item)\n return res\n\ndef get_unique_items(items):\n return filter_unique(items)", "original_code": "def filter_unique(items, seen):\n res = []\n for item in items:\n if item not in seen:\n seen.add(item)\n res.append(item)\n return res\n\ndef get_unique_items(items):\n return filter_unique(items, set())", "initial_error": "AssertionError: test fails on second call", "bug_location": {"function": "filter_unique", "line_start": 4}, "test_cases": [{"input": [[1, 2, 2, 3]], "expected_output": [1, 2, 3]}, {"input": [[1, 2, 2, 3]], "expected_output": [1, 2, 3]}, {"input": [[4, 4, 5]], "expected_output": [4, 5]}, {"input": [[4, 4, 5]], "expected_output": [4, 5]}]} |
| {"id": "t3_010", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "accumulate_values", "buggy_code": "total = 10\ndef add_to_total(val):\n global total\n total += val\n return total\n\ndef accumulate_values(vals):\n return [add_to_total(v) for v in vals]", "original_code": "def accumulate_values(vals):\n total = 0\n res = []\n for v in vals:\n total += v\n res.append(total)\n return res", "initial_error": "AssertionError: expected [1, 3], got [1, 3] then [4, 6] on next call", "bug_location": {"function": "add_to_total", "line_start": 4}, "test_cases": [{"input": [[1, 2]], "expected_output": [1, 3]}, {"input": [[1, 2]], "expected_output": [1, 3]}, {"input": [[5, 5]], "expected_output": [5, 10]}, {"input": [[5, 5]], "expected_output": [5, 10]}]} |
| {"id": "t3_011", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "append_to_default", "buggy_code": "def helper(val, lst=[1]):\n lst.append(val)\n return lst\n\ndef append_to_default(val):\n return helper(val)", "original_code": "def helper(val, lst=None):\n if lst is None:\n lst = []\n lst.append(val)\n return lst\n\ndef append_to_default(val):\n return helper(val)", "initial_error": "AssertionError: expected [2], got [1, 2]", "bug_location": {"function": "helper", "line_start": 1}, "test_cases": [{"input": [1], "expected_output": [1]}, {"input": [2], "expected_output": [2]}, {"input": [3], "expected_output": [3]}, {"input": [4], "expected_output": [4]}]} |
| {"id": "t3_012", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "count_calls", "buggy_code": "calls = 5\ndef tracker():\n global calls\n calls += 1\n return calls\n\ndef count_calls(n):\n res = []\n for _ in range(n):\n res.append(tracker())\n return res", "original_code": "def count_calls(n):\n calls = 0\n res = []\n for _ in range(n):\n calls += 1\n res.append(calls)\n return res", "initial_error": "AssertionError: expected [1, 2], got [3, 4] on second run", "bug_location": {"function": "tracker", "line_start": 4}, "test_cases": [{"input": [2], "expected_output": [1, 2]}, {"input": [2], "expected_output": [1, 2]}, {"input": [3], "expected_output": [1, 2, 3]}, {"input": [3], "expected_output": [1, 2, 3]}]} |
| {"id": "t3_013", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "build_sentence", "buggy_code": "words_cache = ['ERROR']\ndef add_word(w):\n words_cache.append(w)\n return ' '.join(words_cache)\n\ndef build_sentence(words):\n res = ''\n for w in words:\n res = add_word(w)\n return res", "original_code": "def build_sentence(words):\n words_cache = []\n def add_word(w):\n words_cache.append(w)\n return ' '.join(words_cache)\n res = ''\n for w in words:\n res = add_word(w)\n return res", "initial_error": "AssertionError: expected 'hello world', got '... hello world'", "bug_location": {"function": "add_word", "line_start": 3}, "test_cases": [{"input": [["hello", "world"]], "expected_output": "hello world"}, {"input": [["foo", "bar"]], "expected_output": "foo bar"}, {"input": [["a", "b", "c"]], "expected_output": "a b c"}, {"input": [["x"]], "expected_output": "x"}]} |
| {"id": "t3_014", "difficulty": 3, "bug_type": "state_not_reset", "function_name": "collect_errors", "buggy_code": "errors = ['fatal']\ndef log_error(err):\n errors.append(err)\n return errors\n\ndef collect_errors(err_list):\n for e in err_list:\n res = log_error(e)\n return res if err_list else []", "original_code": "def collect_errors(err_list):\n errors = []\n def log_error(err):\n errors.append(err)\n return errors\n res = []\n for e in err_list:\n res = log_error(e)\n return res", "initial_error": "AssertionError: state leak between calls", "bug_location": {"function": "log_error", "line_start": 3}, "test_cases": [{"input": [["e1"]], "expected_output": ["e1"]}, {"input": [["e2"]], "expected_output": ["e2"]}, {"input": [["e3", "e4"]], "expected_output": ["e3", "e4"]}, {"input": [["e5"]], "expected_output": ["e5"]}]} |
| {"id": "t3_015", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "process_data", "buggy_code": "def get_first(lst):\n return lst[0]\n\ndef process_data(data):\n if not data:\n return None\n return [get_first(d) for d in data]", "original_code": "def get_first(lst):\n if not lst:\n return None\n return lst[0]\n\ndef process_data(data):\n if not data:\n return []\n return [get_first(d) for d in data]", "initial_error": "IndexError: list index out of range", "bug_location": {"function": "get_first", "line_start": 2}, "test_cases": [{"input": [[[1, 2], [3, 4]]], "expected_output": [1, 3]}, {"input": [[[1], []]], "expected_output": [1, null]}, {"input": [[[], [2]]], "expected_output": [null, 2]}, {"input": [[]], "expected_output": []}]} |
| {"id": "t3_016", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "average_scores", "buggy_code": "def calc_avg(scores):\n return sum(scores) / len(scores)\n\ndef average_scores(students):\n return {k: calc_avg(v) for k, v in students.items()}", "original_code": "def calc_avg(scores):\n if not scores:\n return 0\n return sum(scores) / len(scores)\n\ndef average_scores(students):\n return {k: calc_avg(v) for k, v in students.items()}", "initial_error": "ZeroDivisionError: division by zero", "bug_location": {"function": "calc_avg", "line_start": 2}, "test_cases": [{"input": [{"Alice": [10, 20], "Bob": []}], "expected_output": {"Alice": 15.0, "Bob": 0}}, {"input": [{"A": [5]}], "expected_output": {"A": 5.0}}, {"input": [{}], "expected_output": {}}, {"input": [{"B": []}], "expected_output": {"B": 0}}]} |
| {"id": "t3_017", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "find_max_nested", "buggy_code": "def find_max(lst):\n return max(lst)\n\ndef find_max_nested(nested_lists):\n return [find_max(l) for l in nested_lists]", "original_code": "def find_max(lst):\n if not lst:\n return None\n return max(lst)\n\ndef find_max_nested(nested_lists):\n return [find_max(l) for l in nested_lists]", "initial_error": "ValueError: max() arg is an empty sequence", "bug_location": {"function": "find_max", "line_start": 2}, "test_cases": [{"input": [[[1, 2], []]], "expected_output": [2, null]}, {"input": [[[1], [2, 3]]], "expected_output": [1, 3]}, {"input": [[[], []]], "expected_output": [null, null]}, {"input": [[]], "expected_output": []}]} |
| {"id": "t3_018", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "get_extensions", "buggy_code": "def extract_ext(filename):\n return filename.split('.')[1]\n\ndef get_extensions(files):\n return [extract_ext(f) for f in files]", "original_code": "def extract_ext(filename):\n parts = filename.split('.')\n if len(parts) < 2:\n return ''\n return parts[-1]\n\ndef get_extensions(files):\n return [extract_ext(f) for f in files]", "initial_error": "IndexError: list index out of range", "bug_location": {"function": "extract_ext", "line_start": 2}, "test_cases": [{"input": [["a.txt", "b"]], "expected_output": ["txt", ""]}, {"input": [["a.txt", "b.pdf"]], "expected_output": ["txt", "pdf"]}, {"input": [["noext"]], "expected_output": [""]}, {"input": [[]], "expected_output": []}]} |
| {"id": "t3_019", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "get_lengths", "buggy_code": "def get_len(item):\n return len(item)\n\ndef get_lengths(items):\n return [get_len(i) for i in items]", "original_code": "def get_len(item):\n if item is None:\n return 0\n return len(item)\n\ndef get_lengths(items):\n return [get_len(i) for i in items]", "initial_error": "TypeError: object of type 'NoneType' has no len()", "bug_location": {"function": "get_len", "line_start": 2}, "test_cases": [{"input": [["abc", null]], "expected_output": [3, 0]}, {"input": [["a", "b"]], "expected_output": [1, 1]}, {"input": [[null, null]], "expected_output": [0, 0]}, {"input": [[]], "expected_output": []}]} |
| {"id": "t3_020", "difficulty": 3, "bug_type": "missing_edge_case", "function_name": "parse_integers", "buggy_code": "def to_int(s):\n return int(s)\n\ndef parse_integers(strings):\n return [to_int(s) for s in strings]", "original_code": "def to_int(s):\n try:\n return int(s)\n except ValueError:\n return 0\n\ndef parse_integers(strings):\n return [to_int(s) for s in strings]", "initial_error": "ValueError: invalid literal for int() with base 10", "bug_location": {"function": "to_int", "line_start": 2}, "test_cases": [{"input": [["1", "abc"]], "expected_output": [1, 0]}, {"input": [["1", "2"]], "expected_output": [1, 2]}, {"input": [["foo", "bar"]], "expected_output": [0, 0]}, {"input": [[]], "expected_output": []}]} |
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